Follow a Good Material for your Preparation if you are not OK with standard Text Book then join some Good Coaching Institutes Like RBR / Made Easy / Ace.

Practice is the key to success. Prefer Quality over quantity. For this Follow GATE Previous Year Question Papers, TIFR Questions (Generally of Higher Level than GATE). Solve At least 3 Times GATE Prev. year question.

In last month join any good Test Series (Made easy & Virtual GATE is recommended) and work on your mistakes.